The obvious is that the manufacturer would not have installed this system nor suffered the expense if it did nothing worthwhile. So at the very least it likely is contributing to cleaner air. If it didn't do that they would have engineered another system to replace it. Here is some info from a Mustang site that is interesting. http://www.supersixmotorsports.com/pdf/PCVBypass.pdf
Opinions on Valve cover Oil breather. Come on in
So after I had the porous block/main seal repair work. My dealership questioned the crankcase pressure. I completely discounted that comment by telling them my PCV tubing, intake plenum were completely dry. I also advised them that I had a catch can installed for approximately 2000 miles and collected not a drop of oil. If the leak were associated with increased crank case pressure, I would have oil in the pcv tubes etc. We agreed on that.
I started to research the pros and cons of a valve cover breather and thought I would try one. I know it will not improve performance but if it will help the existing PCV system reduce pressure, it may be a good thing. I found a Metco breather and installed it along with the existing PCV system. I took a spirited after the install drive and there was no cabin odor, or oil mist collecting on the valve covers and no leak.
My question is: WILL THIS BENEFIT OR HARM MY BUILD?
Here is the product:
http://www.metcomotorsports.com/proddetail.asp?prod=MBR0003
Here is the install photo. I opted to install it in the plastic fill tube although it can also be installed directly into the valve cover.
![]()
I started to research the pros and cons of a valve cover breather and thought I would try one. I know it will not improve performance but if it will help the existing PCV system reduce pressure, it may be a good thing. I found a Metco breather and installed it along with the existing PCV system. I took a spirited after the install drive and there was no cabin odor, or oil mist collecting on the valve covers and no leak.
My question is: WILL THIS BENEFIT OR HARM MY BUILD?
Here is the product:
http://www.metcomotorsports.com/proddetail.asp?prod=MBR0003
Here is the install photo. I opted to install it in the plastic fill tube although it can also be installed directly into the valve cover.
